I paid $800 for my 8 plus. If I get 3 years out of it, that will mean it costs me less than $1 a day. Doing the upgrade program would be around $500 per year(with taxes) and no phone to sell when you upgrade. $799 + taxes = $850. Sell for $300 in 3yr - $550 over 3 years IUP every year = ~$500 a year x 3 years = $1500. No phone to sell to cut the costs So if I keep my 8 plus for 3 years, I’ll effectively save $1k. I can then use that $1k to pay cash for my iPhone purchase in 2020.